rpm/kv calculations

Hello

Im thinking on getting a set of four eflite park 400 brushless motors that are 890 kilo volts. My goal is to lift a bit more weight.

Whats a good formula or source to measure the rpms per kv? and what type of changes on the PID values would someone suggest? also I have a set of four 40 amps ESCs.

Im waiting on somo other motors that are 1025 kvs and im guessing the rpsm are gonna be too high!!! and might make the yaw and stabilization go crazy.

Any good websites or forums that might help would be trully apreciated.

Thank you

4190DJR78SL._SL500_SS100_.jpg Park 450 Brushless Outrunner Motor

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